Surface Tension

Q.

What happens to the viscosity and surface tension of a liquid with an increase in temperature?

Q.

Give one important function of the following:

Steam

Q.

What is the link between cohesive force and evaporation?

Q. When the temperature of a liquid increases, its surface tension
.

1. increases
2. decreases
3. remains constant

Q.

What is the upper limit of the Ionosphere?

Q. Which of the following properties of water can be used to explain the spherical shape of rain droplets?

1. Viscosity
2. Surface tension
3. Critical phenomenon
4. Vapour pressure

Q. The units of both surface tension and surface energy are same.

1. True
2. False

Q. Which of following correctly represents the relation between capillary rise h and capillary radius r?

1. 
2. 
3. 
4. 

Q. $A_1,A_2$-identical molecules
B, C-different molecules
$D_1,D_2$-molecules on a liquid surface
Forces between each pair are:

1. surface tension
2. cohesive forces
3. adhesive forces

Q. Which of the following properties of water can be used to explain the spherical shape of rain droplets?

1. Viscosity
2. Surface tension
3. Critical phenomenon
4. Vapour pressure

Q.

The vapour pressure of acetone at ${20}^{\circ }C$ is 185 torr. When 1.2 g of a non-volatile substance was dissolved in 100 g of acetone at ${20}^{\circ }C$, its vapour pressure was 183 torr. The molar mass $\left(gmo{l}^{-1}\right)$ of the substance is:

1. 32

2. 64

3. 128

4. 488